| /* |
| Copyright 2018 The Kubernetes Authors. |
| |
| Licensed under the Apache License, Version 2.0 (the "License"); |
| you may not use this file except in compliance with the License. |
| You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| */ |
| |
| package scheduling |
| |
| import ( |
| "fmt" |
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" |
| ) |
| |
| // SystemPriorityClasses define system priority classes that are auto-created at cluster bootstrapping. |
| // Our API validation logic ensures that any priority class that has a system prefix or its value |
| // is higher than HighestUserDefinablePriority is equal to one of these SystemPriorityClasses. |
| var systemPriorityClasses = []*PriorityClass{ |
| { |
| ObjectMeta: metav1.ObjectMeta{ |
| Name: SystemNodeCritical, |
| }, |
| Value: SystemCriticalPriority + 1000, |
| Description: "Used for system critical pods that must not be moved from their current node.", |
| }, |
| { |
| ObjectMeta: metav1.ObjectMeta{ |
| Name: SystemClusterCritical, |
| }, |
| Value: SystemCriticalPriority, |
| Description: "Used for system critical pods that must run in the cluster, but can be moved to another node if necessary.", |
| }, |
| } |
| |
| // SystemPriorityClasses returns the list of system priority classes. |
| // NOTE: be careful not to modify any of elements of the returned array directly. |
| func SystemPriorityClasses() []*PriorityClass { |
| return systemPriorityClasses |
| } |
| |
| // IsKnownSystemPriorityClass checks that "pc" is equal to one of the system PriorityClasses. |
| // It ignores "description", labels, annotations, etc. of the PriorityClass. |
| func IsKnownSystemPriorityClass(pc *PriorityClass) (bool, error) { |
| for _, spc := range systemPriorityClasses { |
| if spc.Name == pc.Name { |
| if spc.Value != pc.Value { |
| return false, fmt.Errorf("value of %v PriorityClass must be %v", spc.Name, spc.Value) |
| } |
| if spc.GlobalDefault != pc.GlobalDefault { |
| return false, fmt.Errorf("globalDefault of %v PriorityClass must be %v", spc.Name, spc.GlobalDefault) |
| } |
| return true, nil |
| } |
| } |
| return false, fmt.Errorf("%v is not a known system priority class", pc.Name) |
| } |